Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1d1042fe22538a561fdd8cee751b3ce06d1095132950f756fcb3e1c646bfc2ab' 
  AND token = 'TTCd8xyv9fSkyMXVfkdGdsfnV3hAUWJwx+YfUhmNufI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}